Heat transport of electron-doped Cobaltates

TL;DR

This paper investigates heat transport in electron-doped cobaltates using the t-J model and fermion-spin theory, revealing a temperature-dependent thermal conductivity with a low-temperature peak consistent with experimental observations.

Contribution

It provides a theoretical analysis of thermal conductivity behavior in electron-doped cobaltates within the t-J model framework, aligning with experimental data.

Findings

Thermal conductivity shows a low-temperature peak at finite T.

Thermal conductivity increases at very low T and decreases at higher T.

Results qualitatively agree with experimental data from Na_xCoO_2.

Abstract

Within the t-J model, the heat transport of electron-doped cobaltates is studied based on the fermion-spin theory. It is shown that the temperature dependent thermal conductivity is characterized by the low temperature peak located at a finite temperature. The thermal conductivity increases monotonously with increasing temperature at low temperatures T $<$ 0.1$J$, and then decreases with increasing temperature for higher temperatures T $>$ 0.1$J$, in qualitative agreement with experimental result observed from Na$_{x}$CoO$_{2}$ .